Apparatus and process for extruding elastomeric material



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DEFENSIVE PULICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED DECEMBER 16, 1969 T869,007 APPARATUS AND PROCESS FOR EXTRUDINGELASTOMERIC MATERIAL Martin Luther Brown, Elkton, Md., assiguor to E. I.du

Pont de Nemours and Company, Wilmington, Del., a corporation of DelawareOriginal application Oct. 22, 1965, Ser. No. 501,552.

Divided and this application Dec. 26, 1968, Ser.

Int. Cl. B29f 3/10, 3/012 U.S. Cl. 264-174 1 Sheet Drawing. 11 PagesSpecification A process for sequentially heating to curing temperatureand extruding a fast-curing elastomeric compound by introducing a rawstock directly into an extrusion head where the stock is heated tocuring temperatures with heat generated :by shearing the stock between arotor housing and a rotor having a relief pattern on its surface androtating at ZOO-2,000 r.p.m. then extruding the heated elastomer througha die.

The apparatus that can be used to carry out this process is an extrudermade of a housing having a bore and an extrusion cavity with anextrusion orifice. The rotatable shaft is in the bore and is alignedwith the extrusion orifice terminating in the extrusion cavity with ageometrically shaped rotor which defines a narrow annular passagewaybetween the exterior surface of the rotor and the interior surface ofthe housing.

This process of friction heating an elastomeric material to its curingtemperature also softens the material permitting a controllabledischarge of the extrudate through the extrusion orifice. This processcan be used to provide an outer coating of elastomeric material on awire by axially drawing the wire through the center of the die orificeconcurrently with the extrusion of an elastomeric material.

Dec. V16, 1969 M. L. BROWN $369,097

APPARATUS AND PROCESS FOR EXTRUDING ELASTOMERIC MATERIAL Original FiledOct. 22, 1965 INVENTOR :5; MARTIN LUTHER BROWN ATTORNEY

